drm/amd/display: Add Support for HDMI Compliance Automation

Add support to get DUT trained at FRL link rate when working with
Teledyne M41h compliance automation.

Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

@@ -877,6 +877,9 @@ struct amdgpu_dm_connector {
 	unsigned int hdmi_hpd_debounce_delay_ms;
 	struct delayed_work hdmi_hpd_debounce_work;
 	struct dc_sink *hdmi_prev_sink;
+
+	/* HDMI compliance automation */
+	bool hdmi_comp_auto;
 };
 
 static inline void amdgpu_dm_set_mst_status(uint8_t *status,

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_connector.c

@@ -573,6 +573,11 @@ void amdgpu_dm_update_connector_after_detect(
 		amdgpu_dm_update_freesync_caps(connector, aconnector->drm_edid, true);
 		amdgpu_dm_update_connector_ext_caps(aconnector);
 		dm_set_panel_type(aconnector);
+
+		if (aconnector->hdmi_comp_auto) {
+			if (sink->sink_signal != SIGNAL_TYPE_HDMI_FRL)
+				sink->sink_signal = SIGNAL_TYPE_HDMI_FRL;
+		}
 	} else {
 		hdmi_cec_unset_edid(aconnector);
 		drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

@@ -2982,6 +2982,64 @@ static ssize_t hdmi_cec_state_write(struct file *f, const char __user *buf,
 	return size;
 }
 
+/**
+ * hdmi_automation_enable - Enable/Disable HDMI automation feature
+ * @f: file structure.
+ * @buf: userspace buffer. set to '1' to enable; '0' to disable automation feature.
+ * @size: size of buffer from userpsace.
+ * @pos: unused.
+ *
+ * Return size on success, error code on failure
+ */
+static ssize_t hdmi_automation_enable(struct file *f, const char __user *buf,
+	size_t size, loff_t *pos)
+{
+	struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
+	char *wr_buf = NULL;
+	const uint32_t wr_buf_size = 40;
+	int max_param_num = 1;
+	uint8_t param_nums = 0;
+	long param[2];
+	bool hdmi_comp_auto;
+
+	if (size == 0)
+		return -EINVAL;
+
+	wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
+	if (!wr_buf)
+		return -ENOSPC;
+
+	if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+					   (long *)param, buf,
+					   max_param_num,
+					   &param_nums)) {
+		kfree(wr_buf);
+		return -EINVAL;
+	}
+
+	if (param_nums <= 0) {
+		kfree(wr_buf);
+		DRM_DEBUG_DRIVER("user data not be read\n");
+		return -EINVAL;
+	}
+
+	switch (param[0]) {
+	case 0:
+		hdmi_comp_auto = false;
+		break;
+	case 1:
+	default:
+		hdmi_comp_auto = true;
+		break;
+	}
+
+	/* Persist setting across sink re-detection/hotplug. */
+	aconnector->hdmi_comp_auto = hdmi_comp_auto;
+
+	kfree(wr_buf);
+	return size;
+}
+
 DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
 DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
 DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
@@ -3099,6 +3157,12 @@ static const struct file_operations dp_mst_link_settings_debugfs_fops = {
 	.llseek = default_llseek
 };
 
+static const struct file_operations hdmi_automation_debugfs_fops = {
+	.owner = THIS_MODULE,
+	.write = hdmi_automation_enable,
+	.llseek = default_llseek
+};
+
 static const struct {
 	char *name;
 	const struct file_operations *fops;
@@ -3131,7 +3195,8 @@ static const struct {
 	const struct file_operations *fops;
 } hdmi_debugfs_entries[] = {
 		{"hdcp_sink_capability", &hdcp_sink_capability_fops},
-		{"hdmi_cec_state", &hdmi_cec_state_fops}
+		{"hdmi_cec_state", &hdmi_cec_state_fops},
+		{"hdmi_automation", &hdmi_automation_debugfs_fops}
 };
 
 /*

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

@@ -193,6 +193,12 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
 					__func__, connector->name, edid_caps->frl_dsc_10bpc, edid_caps->frl_dsc_12bpc, \
 					edid_caps->frl_dsc_all_bpp, edid_caps->frl_dsc_native_420, edid_caps->frl_dsc_max_slices, \
 					edid_caps->frl_dsc_max_frl_rate, edid_caps->frl_dsc_total_chunk_kbytes);
+		if (aconnector->hdmi_comp_auto) {
+			edid_caps->panel_patch.hdmi_comp_auto = true;
+			link->ctx->dc->debug.force_frl_max = true;
+			link->ctx->dc->debug.force_frl_dsc = true;
+			drm_dbg_driver(connector->dev, "%s: HDMI_FRL [%s] hdmi_comp_auto --> enabled\n", __func__, connector->name);
+		}
 	}
 
 	apply_edid_quirks(link, edid_buf, edid_caps);